<template>
  <div>
      <div class="slide-show" @mouseover="clearInv" @mouseout="runInv">
          <div class="slide-img">
              <a :href="slides[nowIndex].href">
                  <transition name="slide-trans">
                    <img  v-if="isShow" :src="slides[nowIndex].src">
                  </transition>
                  <transition name="slide-trans-old">
                    <img  v-if="!isShow" :src="slides[nowIndex].src">
                  </transition>
              </a>
          </div>
          <h2>{{slides[nowIndex].title}}</h2>
          <ul class="slide-pages">
              <li @click="goto(prevIndex)">&lt;</li>
              <li v-for="(item,index) in slides" @click="goto(index)">
                  <a :class="{on:index===nowIndex}">{{index+1}}</a>
             </li>
             <li @click="goto(nextIndex)">&gt;</li>
          </ul>
      </div>
  </div>
</template>

<script>
export default {
    props:{
        slides:{
            type: Array,
            default:[]
        },
        inv:{
            type:Number,
            default:1000
        }
    },
    methods:{
        goto(index){
            this.isShow=false
            setTimeout(()=>{
                this.isShow=true
                this.nowIndex=index
                this.$emit('onchange',index)
            },10)
        
        },
        runInv(){
           this.invId = setInterval(()=>{
               this.goto(this.nextIndex)
           },this.inv)
        },
        clearInv(){
            clearInterval(this.invId)
        }
    },
    computed:{
        prevIndex () {
            if(this.nowIndex==0){
                return this.slides.length-1;
            }else{
                return this.nowIndex-1;
            }
        },
        nextIndex(){
            if(this.nowIndex==this.slides.length-1){
                return 0;
            }else{
                return this.nowIndex+1;
            }
        }
    },
    data(){
      return{
          nowIndex: 0,
          isShow:true
      }
  },
  mounted(){
    this.runInv()
  }
}
</script>


<style scoped>
.slide-trans-enter-active {
  transition: all .5s;
}
.slide-trans-enter {
  transform: translateX(900px);
}
.slide-trans-old-leave-active {
  transition: all .5s;
  transform: translateX(-900px);
}
.slide-show {
  position: relative;
  margin: 15px 15px 15px 0;
  width: 900px;
  height: 500px;
  overflow: hidden;
}
.slide-show h2 {
  position: absolute;
  width: 100%;
  height: 100%;
  color: #fff;
  background: #000;
  opacity: .5;
  bottom: 0;
  height: 30px;
  text-align: left;
  padding-left: 15px;
}
.slide-img {
  width: 100%;
}
.slide-img img {
  width: 100%;
  position: absolute;
  top: 0;
}
.slide-pages {
  position: absolute;
  bottom: 10px;
  right: 15px;
}
.slide-pages li {
  display: inline-block;
  padding: 0 10px;
  cursor: pointer;
  color: #fff;
}
.slide-pages li .on {
  text-decoration: underline;
}
</style>
